22) The following situations showed a strong correlation. Which situation is an example of causation?
a. The fewer police substations in a city, the higher the number of crimes that occur there.
b. The higher the number of miles a car is driven, the less gasoline is left in the tank.
c. The farther students sit from the front of the class, the lower their grades.
d. The more years of education a person has the higher their income.